Just my thoughts, but....

WipeoutHD features online play, it's one of the key elements, right?

The PS3 has no common framework accoss all games yet for chat, invites, etc, games do provide this at varing levels but it's not common across all games/devs. Many of these features are coming either a XMB update or HOME. Maybe WipeoutHD needs these new features enabled first as it's a Sony 1st party game BEFORE the online elements will work as planned.

Could this be the reason for multiple delay(s), Not WO:HD, Not SL but the core online elements that are planned for the PS3 but not out yet for whatever reason. I know that GT5p online sucks the fat one without private races, chat and the like.

Just a thought ...